"For that matter, I'd love it if I could also find out the change level represented by a client that was synced at some arbitrary time in the past. The metadata must have this."

I think that "p4 files ...#have" gives a good cut at this. The problem with believing that a client is in sync with 'up to change #12345" is that often people bring one directory to "current" but leave the rest at a "stable" place.

So the per-file revision list ("p4 files ...#have") might be more accurate. Your choice.

-Jeff Bowles